Established in 1994, Koenigsegg is already 23 years old as of 2017. And for a 23-year-old company, it has developed into quite the successful business. It all started with variations of the CC in the early 2000s and continued with the Agera in 2010. In 2015, the Swedish firm launched the Regera, its first ever hybrid. Come 2017 and Koenigsegg is working on brand-new vehicles, one of which is most likely a four-door sedan.